<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Bootstrap demo</title>
  <link href="./lib/bootstrap/bootstrap.min.css" rel="stylesheet"  crossorigin="anonymous">
</head>
<body>

<!--这里写拷贝的代码-->
<h1>Hello, world!</h1>
<script src="./lib/bootstrap/bootstrap.bundle.min.js"  crossorigin="anonymous"></script>
</body>
</html>